576results about How to "Improve color uniformity" patented technology

An exit pupil extender wherein the relative amount of different color components in the exit beam is more consistent with that of the input beam. In order to compensate for the uneven amount in the diffracted color components in the exit beam, the exit pupil extender, comprises a plurality of layers having additional diffraction gratings so as to increase the amount of diffracted light for those color components with a lower amount. Additionally, color filters disposed between layers to reduce the diffracted light components with a higher amount.

A lighting device in which a solid state light emitter in a first multi-chip light emitter is spatially offset relative to a solid state light emitter in a second multi-chip light emitter. A lighting device comprising first, second and third multi-chip light emitters, in which any solid state light emitter in the second multi-chip light emitter that is spatially offset relative to a first solid state light emitter on the first multi-chip light emitter by less than 10 degrees emits light of a hue that differs from the hue of light emitted by the first solid state light emitter by more than seven MacAdam ellipses. A solid state light emitter support member comprising a center region and at least first, second and third protrusions extending from the center region. A lighting device comprising at least a first housing member, and means for emitting substantially uniform light.

An optical manifold for efficiently combining a plurality of blue LED outputs to illuminate a phosphor for a single, substantially homogeneous output, in a small, cost-effective package. Embodiments are disclosed that use a single or multiple LEDs and a remote phosphor, and an intermediate wavelength-selective filter arranged so that backscattered photoluminescence is recycled to boost the luminance and flux of the output aperture. A further aperture mask is used to boost phosphor luminance with only modest loss of luminosity. Alternative non-recycling embodiments provide blue and yellow light in collimated beams, either separately or combined into white.

A white light emitting device including: a blue LE chip having a dominant wavelength of 430 to 455 nm; a red phosphor disposed around the blue light emitting diode chip, the red phosphor excited by the blue light emitting diode chip to emit red light; and a green phosphor disposed around the blue light emitting diode chip, the green phosphor excited by the blue LED chip to emit green light, wherein the red light emitted from the red phosphor has a color coordinate falling within a space defined by four coordinate points (0.5448, 0.4544), (0.7079, 0.2920), (0.6427, 0.2905) and (0.4794, 0.4633) based on the CIE 1931 chromaticity diagram, the green light emitted from the green phosphor has a color coordinate falling within a space defined by four coordinate points (0.1270, 0.8037), (0.4117, 0.5861), (0.4197, 0.5316) and (0.2555, 0.5030) based on the CIE 1931 color chromaticity diagram, and the red phosphor includes a phosphor represented by (Sr, Ba, Ca)AlSiN3:Eu and the green phosphor includes a phosphor represented by (Sr, Ba, Ca)2SiO4:Eu.

A color tunable light source comprises: a first light emitting diode (LED) arrangement operable to emit light of a first color and a second LED arrangement operable to emit light of a second color, the combined light output comprising the output of the source. One or both LED arrangements comprises a phosphor provided remote to an associated LED operable to generate excitation energy of a selected wavelength range and to irradiate the phosphor such that it emits light of a different color wherein light emitted by the LED arrangement comprises the combined light from the LED and phosphor and control means operable to control the color by controlling the relative light outputs of the two LED arrangements. The color can be controlled by controlling the relative magnitude of the drive currents of the LEDs or by controlling a duty cycle of PWM drive current.

The present invention provides a backlight device which uses solid-state light emitting elements capable of emitting lights of three colors consisting of red, green and blue as a light source, can enhance the light utilizing efficiency, and can be made light-weighted. Further, the invention provides a display device which exhibits the high brightness uniformity and the high chromaticity uniformity. The backlight device includes a main light guide plate which has a light irradiation surface which irradiates light forwardly by developing the light in plane and has a light reflection surface which faces the light irradiation surface in an opposed manner and reflects the light toward the light irradiation surface; a sub light guide plate which is arranged on a back surface of the main light guide plate, is divided into a first sub light guide plate and a second sub light guide plate on both end sides by way of a first air layer disposed at a center portion, and forms light incident surfaces on facing end surfaces of the first sub light guide plate and the second sub light guide plate in the inside of the first air layer; a first light reflection plate which is arranged on a front surface of the sub light guide plate which faces the main light guide plate; a second light reflection plate which is arranged on a back surface of the sub light guide plate which faces the first light reflection plate in an opposed manner; reflectors which are arranged on both end surfaces of the main light guide plate and the sub light guide plate and optically couple the main light guide plate and the sub light guide plate; and a light emitting diode board which is mounted in a state that the light emitting diode board faces a back surface of the sub light guide plate and light emitting diodes capable of emitting light of plurality of colors in the inside of the first air layer are arranged at least in a row. Due to such a constitution, a light-source light from the light emitting diodes capable of emitting lights of plurality of colors is subjected to color mixture and an effective optical path can be elongated and hence, the light utilizing efficiency can be enhanced and, at the same time, the backlight device can be made light-weighted.

The present invention provides a display device comprising a display panel and a backlight device comprising a main light guide body which irradiates light toward the display panel. A sub light guide body is arranged on the back surface of the main light guide body is divided in the center by a first air layer. Both end portions of the sub light guide are optically coupled to the main light guide, and a plurality of solid state light emitting elements are arranged in the inside of the air layer of the sub light guide.

A light emitting device comprises at least one solid-state light source (LED) operable to generate excitation light and a wavelength conversion component located remotely to the at least one source and operable to convert at least a portion of the excitation light to light of a different wavelength. The wavelength conversion component comprises a light transmissive substrate having a wavelength conversion layer comprising particles of at least one photoluminescence material and a light diffusing layer comprising particles of a light diffractive material. This approach of using the light diffusing layer in combination with the wavelength conversion layer solves the problem of variations or non-uniformities in the color of emitted light with emission angle. In addition, the color appearance of the lighting apparatus in its OFF state can be improved by implementing the light diffusing layer in combination with the wavelength conversion layer. Moreover, significant reductions can be achieved in the amount phosphor materials required to implement phosphor-based LED devices.

An LED lens and a light emitting device using the same are disclosed. The LED lens comprises a light incident surface, a light emitting surface, and a bottom surface. The light emitting surface includes a first recession portion disposed at the central thereof and a protrusion portion connected to the outer periphery of the emitting recession portion. The light incident surface comprises a first optically active area and a second optically active area. The first optically active area is disposed at the central of the light incident surface, and has a second recession portion; the second optically active area is a concave surface connected to the first optically active area. The LED lens satisfies specific conditions. The LED lens distributes a light beam emitted from the light emitting device to form an even light pattern.

A liquid crystal display module includes a cover bottom, a reflection sheet over the cover bottom, a light guide plate over the reflection sheet and including at least one first protrusion, a lamp at a side of the light guide plate, optical sheets over the light guide plate, a support main surrounding the light guide plate and the optical sheets and including a projected part at an inner surface thereof, a liquid crystal panel disposed supported by the projected part of the support main, a light-blocking tape between the projected part and the liquid crystal panel, the light-blocking tape including at least one second protrusion corresponding to the at least one first protrusion, and a top cover covering edges of a front surface of the liquid crystal panel and combined with the support main and the cover bottom.

This invention relates to optical devices. More specifically, the present invention relates to a collimated optical light source assembly that produces a uniform white light. Specifically, light from a multi-cavity RGB LED array is dispersed in a reflecting cavity having a Lambertian texture on the interior surface. The light is then emitted though a lenslet array and a cone lens which together further disperses the light emitted by the individual LEDs. The dispersed light is then collimated by a reflector.

The invention discloses a display panel and a display device. The display panel comprises a first display area and a second display area, and the light transmittance of the first display area is larger than that of the second display area. The display panel comprises first pixel groups located in the first display area and second sub-pixels located in the second display area, wherein each first pixel group comprises a first light-emitting pixel unit and a first non-light-emitting sub-pixel, and the first light-emitting pixel unit comprises first light-emitting sub-pixels; and the first pixel arrangement structure formed by the first light-emitting sub-pixels and the first non-light-emitting sub-pixels is the same as the second pixel arrangement structure formed by the second sub-pixels. According to the display panel provided by the embodiment of the invention, the boundary between the second display area with the higher PPI and the transition display area with the lower PPI in the display picture of the display panel is fuzzified, so that an obvious boundary between the two display areas is avoided, and the display effect is improved.

A thin light source unit employs a plurality of light emitting diode chips in multiple colors to generate highly uniform white light at a low cost and with a high light utilization efficiency. The light source unit has light emitting diode chips, lead frames, and a transparent sealer. A plurality of the light emitting diode chips in the same color are connected in series to three or more sets of the lead frames. The light emitting diode chips in at least three different colors are integrally sealed with the transparent sealer. An illuminating apparatus using the light source units, and a display apparatus using the illuminating apparatus are also provided.

The present invention provides an integrated backlight illumination assembly for an LCD display comprising, a substrate for providing structural and functional support to the assembly, a bottom reflector provided on the substrate and a plurality of solid state light sources provided in an opening of the bottom reflector for providing a point light source. Further, the invention provides a plurality of light films with a thickness between 10 microns to 3mm and having light redirecting areas provided between the plurality of solid state light sources for redirecting and spreading the point light source to a uniform plane of light and a top diffuser for diffusing the uniform plane of light, and wherein the plurality of light films has a thickness between 0.1 mm to 1.0 mm and a bending stiffness between 50 to 1200 millinewtons.

The invention especially provides a display device (1) with a liquid crystal display (LCD) panel (10) and a backlight illumination device (20), wherein the backlight illumination device (20) comprises a light emitting diode package (200) arranged to generate white backlight (251), wherein the light emitting diode package (200) comprises a blue light emitting diode, LED (201), a green luminescent material (203) and a red luminescent material (204); and a transmissive ceramic layer (206), arranged to transmit at least part of the blue emission (249), wherein the transmissive ceramic layer (206) comprises at least part of the green luminescent.material (203) and / or the red luminescent material (204). The LED (201), the green luminescent material (203) and the red luminescent material (204) are arranged to generate white light (250) for backlighting the liquid crystal display panel (10).

Multilayer polymeric films and other optical bodies are provided which is useful in making colored mirrors and polarizers. The films are characterized by a change in color as a function of viewing angle.

An object of the present invention is to improve the color reproduction capability of a liquid crystal display backlight using white LEDs.A backlight of the present invention includes: a light guide plate 6; a light diffusing optical waveguide 3 disposed adjacent the light guide plate 6; a plurality of white LEDs 1 disposed on the light diffusing optical waveguide 3; and single color LEDs (red LEDs) 2 disposed on respective opposite sides of the light diffusing optical waveguide 3; wherein light from the white LEDs 1 passes through the light diffusing optical waveguide 3 and enters the light guide plate 6 through a side thereof, whereas light from the single color LEDs 2 is diffused by the light diffusing optical waveguide 3 before entering the light guide plate 6 through the same side thereof. Thus, the light diffusing optical waveguide 3 mixes light from the white LEDs 1 and single color LEDs 2, resulting in improved color reproduction capability of the backlight.

The invention discloses a point-by-point correcting system and a point-by-point correcting method for LED display screen. The system comprises an LED display screen, a data acquisition unit, a correcting unit, a revision unit and a video controller; the data acquisition unit is connected with the correcting unit; the correcting unit is connected with the LED display screen through the video controller; and the revision unit is connected with the correcting unit. The method comprises the following steps of: calculating correction coefficient after calculation preparation of correction coefficient, and revising the calculated correction coefficient, then correcting point by point through the revised correction coefficient. The point-by-point correcting system using the point-by-point correcting method, as the system is provided with a revising unit for revising the correction coefficient and correcting point by point through the revised correction coefficient, can not only improve chromaticity uniformity of the LED display screen but also remove the phenomenon of snow point and pock mark.

A capacitive touch panel including a transparent substrate, a plurality of first metal wires, an insulation layer, a plurality of first sensing units, a plurality of second sensing units and a plurality of second metal wires are provided. The transparent substrate has a substrate surface on which the first metal wires, the first sensing units and the second sensing units are formed. The insulation layer can cover a portion of each first metal wire, which is connected to two of the first sensing units, wherein each second metal wire is connected to two of the second sensing units.

Provided is a polycarbonate resin composition pellet, which has a light transmittance at a wavelength of 380 nm of 97.0% or more when the light transmittance is measured by using a methylene chloride solution having a concentration of 12 g / dL, the solution being charged into a quartz glass cell having an optical path length of 5 cm, and which has a viscosity-average molecular weight (Mv) of from 11,000 to 22,000.

A light emitting device, including an LED semiconductor die, a photoluminescent structure and a reflector, is disclosed. The photoluminescent structure with a beveled edge surface is disposed on top of the LED semiconductor die, wherein a lower surface of the photoluminescent structure adheres to an upper surface of the LED semiconductor die. A reflective resin material is disposed surrounding edge surfaces of the LED semiconductor die and the photoluminescent structure forming a beveled reflector. A method to manufacture the above light emitting device is also disclosed. Advantages of this light emitting device with beveled reflector include increasing the light extraction efficiency, making the viewing angle tunable, improving spatial color uniformity and reducing the light source etendue realized in a compact form-factor size.

The invention discloses an image inking and fusing method and system based on histogram feature point registration. The method comprises the following steps: according to image brightness histogram characteristics, extracting histogram extremum points, and adopting one-dimensional Gaussian to smoothly inhibit the local noise points of a brightness histogram; meanwhile, constructing matching relationship among the histogram extremum points in a way that a matching cost function is used to eliminate a matching matrix M; and taking the matched histogram extremum points as histogram characteristic points. The histogram characteristic points are utilized, and image brightness is corrected by adopting the corresponding brightness values of the histogram characteristic points of an image overlapping region. The image which exhibits a big visual angle and big close-range chromatic aberration can be subjected to hue difference processing, hue differences of a plurality of image overlapping regions and non-overlapping regions can be automatically eliminated, and effects of local zone hue balance of the image and the integral hue balance of a panorama image of spliced streetscape can be achieved.

A reflection-type color filter (30) is disclosed, in which light coming into one surface of a color filter layer (36) is reflected by a reflective layer (40) and allowed to pass through the color filter layer (36) twice. Colored patterns of the color filter layer (36) include resin such as polyimide and dye for dyeing the resin. The thickness of the colored patterns is 0.7 mum or less. In order to enhance light resistance, it is effective to increase the content of dye with respect to resin. The value of 0.7 mum is established in consideration of enhancement of optical characteristic and light resistance of the color filter used in the reflection type liquid crystal display device. In order to enhance light resistance, more preferably, a metal complex is added to the resin.

A backlight unit includes a plurality of lamp array units, each having a plurality of LED lamps evenly arranged in one direction, a reflecting substance formed on an upper surface of each of the LED lamps to reflect light emitted from the corresponding LED lamp in a lateral direction, a light dispersion member provided over the lamp array units, and an outer case supporting the light dispersion member.